AMC3844B CONTROLLER Datasheet

AMC3844B Datasheet, PDF, Equivalent


Part Number

AMC3844B

Description

(AMC3842B - AMC3845B) CURRENT MODE PWM CONTROLLER

Manufacture

ADDtek

Total Page 11 Pages
Datasheet
Download AMC3844B Datasheet


AMC3844B
AMC3842B/43B/44B/45B
www.addmtek.com
CURRENT MODE PWM CONTROLLER
DESCRIPTION
FEATURES
The AMC3842B/43B/44B/45B are fixed frequency „ Low Start-Up current (max. 200µA)
current-mode PWM controllers specially designed for „ Optimized for Off-Line and DC-to-DC
OFF-Line switching power supply and DC-to-DC converters
Converters
with a minimum number of external components. These
www.DataSheet4dUev.ciocmes feature a trimmed oscillator for precise duty cycle „ Maximum Duty Cycle
control, a temperature compensated reference, high gain error „ U.V.L.O. with Hysteresis
amplifier, current sensing comparator, and high current totem „ Operating Frequency Up to 500KHz
pole output which is suitable for driving MOSFETs.
„ Internal Trimmed Bandgap Reference
The under voltage lock-out (U.V.L.O.) is designed to „ High Current Totem Pole Output
operated with 200µA start-up current in typical, allowing an „ Error Amplifier With Low Output Resistance
efficient bootstrap supply voltage design. The U.V.L.O.
thresholds for the AMC3842B/44B are 16V (on) and 10V
„
Available in 8-Pin Plastic DIP and Surface
(off), which are ideal for off-line applications. The
Mount 14-Pin S.O.I.C.
corresponding typical threshold for the AMC3843/45BB is „ Identical pin assignment to earlier UC384X
8.4V (on) and 7.6V (off). The AMC3842B/43B can operate
within 100% duty cycle and the AMC3844B/45B can operate
series.
within 50% duty cycle.
APPLICATIONS
„ Off-line flyback or forward converters.
„ DC-to-DC buck or boost converter.
„ Monitor Power Supply
Device
AVAILABLE OPTIONS
Start-UP
Voltage
Hysteresis
Max. Duty
Cycle
AMC3842B 16V
6V
< 100%
AMC3843B 8.4V
0.8V
< 100%
AMC3844B
AMC3845B
16V
8.4V
6V
0.8V
< 50%
< 50%
PACKAGE PIN OUT
COMP
VREF
VFB
VCC
ISENSE
OUTPUT
RT/CT
GND
8-Pin Plastic DIP
(Top View)
COMP
NC
VFB
NC
ISENSE
NC
RT/CT
VREF
NC
VCC
VC
OUTPUT
GND
PWR
14-Pin Plastic S.O.I.C.
Surface Mount
(Top View)
COMP
VFB
ISENSE
RT/CT
VREF
VCC
OUTPUT
GND
8-Pin Plastic S.O.I.C.
Surface Mount
(Top View)
ORDER INFORMATION
TA (OC)
M
Plastic DIP-8
8-pin
D
Plastic SO-14
14-pin
DM
Plastic SO-8
8-pin
0 to 70 AMC384XBM
AMC384XBD
AMC384XBDM
0 to 70 AMC384XBM (Lead Free) AMC384XBD (Lead Free) AMC384XBDM (Lead Free)
Note: 1. All surface-mount packages are available in Tape & Reel. Append the letter “T” to part number (i.e. AMC384XBDT, or
AMC384XBDMT).
2. The letter ”F” is marked for Lead Free process.
Copyright © 2006 ADDtek Corp.
1 DD019_F -- OCTOBER 2006

AMC3844B
AMC3842B/43B/44B/45B
ABSOLUTE MAXIMUM RATINGS (Note 1)
Supply voltage, VCC
Output current, IO
Analog inputs, VI
Error amp output sink current, ISINK(EA)
www.DataSheet4PUo.wcoemr dissipation (TA = 25 OC), PD
Maximum juncture temperature, TJ
Storage temperature range
Lead temperature (soldiering, 10 seconds)
35V
± 1A
-0.3V to 6.3V
10mA
1W
150 OC
-65OC to 150OC
260 OC
Note 1:
Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into,
negative out of the specified terminal.
THERMAL DATA
M PACKAGE:
Thermal Resistance-Junction to Ambient, θJA
D PACKAGE:
Thermal Resistance-Junction to Ambient, θJA
DM PACKAGE:
Thermal Resistance-Junction to Ambient, θJA
Junction Temperature Calculation: TJ = TA + (PD × θJA).
The θJA numbers are guidelines for the thermal performance of the device/pc-board system.
All of the above assume no ambient airflow.
95 OC/W
120 OC/W
165 OC/W
Copyright © 2006 ADDtek Corp. 2 DD019_F -- OCTOBER 2006


Features AMC3842B/43B/44B/45B www.addmtek.com DES CRIPTION The AMC3842B/43B/44B/45B are f ixed frequency current-mode PWM control lers specially designed for OFF-Line sw itching power supply and DC-to-DC conve rters with a minimum number of external components. These www.DataSheet4U.com devices feature a trimmed oscillator fo r precise duty cycle control, a tempera ture compensated reference, high gain e rror amplifier, current sensing compara tor, and high current totem pole output which is suitable for driving MOSFETs. The under voltage lock-out (U.V.L.O.) is designed to operated with 200µA sta rt-up current in typical, allowing an e fficient bootstrap supply voltage desig n. The U.V.L.O. thresholds for the AMC3 842B/44B are 16V (on) and 10V (off), wh ich are ideal for off-line applications . The corresponding typical threshold f or the AMC3843/45BB is 8.4V (on) and 7. 6V (off). The AMC3842B/43B can operate within 100% duty cycle and the AMC3844B /45B can operate within 50% duty cycle. APPLICATIONS „ „ „ „ „ „.
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